Sewing-machine shuttle



UNITED STATES PATENT OFFICE.

`SAMUEL BIBARTHOLOMEW, 40F SPRINGFIELD, MASSACHUSETTS.

SEWING-MACHINE SHUTTLE.

SPECIFICATION forming part of Letters Vllatent'Nc. 269,998, dated January 2, 1883,

` Application filed June 6, 1882. (No model.)

To allwhom it may concern Be it known that I, SAMUEL B. BAR'rHorfv OMEW, a citizen of the United States, residing at Springfield, in the county ot Hampden and State of l\fIassachusetts,have invented new and usetul Improvements in Sewing-Machine Shuttles, of which the followingk is a specification.

This invention relates to an improved tension for the thread of sewing-machine shuttles, having for its object `the security of the thread when in its operative position in the shuttle, together with facility of adjustment of the thread to said position. This I accomplish by means as fully hereinafter described, and illustrated in the accompanying'drawings, in Which.-

Figure I is a rear side view, in partial section, of a shuttle having my improvements.

Fig. II is the same as Fig. I, with the bobbin and tension-spring removed; .and Fig. III' is a plan View with the bobbin removed.

B is the front. plateoia shuttle having its rear face shown in Figs. I and II.

C is theribframing and seatingthe-bobbin D, formed and secured in the shuttle in the usual Way.

lis a spring, secured at one end to the inner fare'of the spring.

'lo construct my improved tension, an eye or opening, h, is formed in the spring I, as

plate B, and forming the tensionshown in Fig. I, to be in prolongation with an opening, f, in the plate B. While the opening h has a continuous edge, the opening j' is connected bya passage, o, with ythe outside.

.ThespringI isalso provided with the eye g, and

is pointed as at u, to lead the thread through surfaces@ o from the outer edge of the spring to the eye g from the inner edge, as shown in Fig. I.

In the operation ot' threading, the end of the thread bis passed through the hole h in the I tension-spring I and continued through `the openingf to the front face of plate B, from Nwhich position it is grasped by the ,hand to have the thread borne up through passage c against the unbroken surface of springI, to move between the plate B and spring I and follow the edge of the spring to the eye g, at the end of which operation it is in the position shown in Fig. I; vand it Will be seen that, as entirelyinclosed by opening h, it is impossible for an unbroken thread to become detached from the spring I. In practice I connect the eye h with an auxiliary one, placed at any convenient point in the spring, by means of the channel m, having a direction from eye h approximating tothat` taken by the thread when moved along the spring from the opening o, and I bevel the outer edges of the openingc, as indicated in Figs. II and III, to remove any angle which might catch the thread in moving along the edge ofthe shuttle, as wellas to facilitate the movementofthethreadin threading77 After the thread b is entirely inclosed by the spring in being passed through eye h, it is only one motion to complete the threading.

l. In a sewing-machine shuttle, the combination andarrangement,substantiallyasshown and described, oi' the tension-spring I, having eye h and eye g, with plate B, having eyef in prolongation of eye h, and provided with an outlet, o, for the, purpose as set forth.

2. The combination and arrangement with plate B, having eye f therein, with its outlet c, vof spring I, provided with eyes h and h', and connectingfchannel m, continuously inclosed, and with eye g and guiding-surface leading thereto, substantially as shown and described.

SAMUEL B. BARTHOLOMEW.

Witnesses: 

